Calculators— Guides & Articles

• How to Find the GCF of 3 Numbers in One Step

  Published 2026-08-20

  Calculate the greatest common factor (GCF) of three numbers instantly using a free online tool that shows the exact steps and works for any integers.

  

• How to Figure Gas Mileage Cost for Work Reimbursement

  Published 2026-08-20

  Figure out your gas mileage cost for work driving: measure your real MPG, multiply by your gas price. A clean method for reimbursement and tax logs.

  

• How to Convert Frequency to Hertz: Methods and Formulas

  Published 2026-08-19

  Convert any frequency to hertz with SI formulas or an online calculator. Covers Hz, kHz, MHz, GHz, THz, rad/s, rpm, BPM and deg/s with worked examples.

  

• How to Convert Force Into Torque — The Formula

  Published 2026-08-19

  Force and torque aren't interchangeable units — you need a lever-arm distance. Here's the formula and how to convert force units (N, lbf, kgf, kip) first.

  

• How to Calculate Flooring for Laminate: Boxes & Waste

  Published 2026-08-19

  How to calculate flooring for laminate in feet or metres: room area, waste allowance, and the number of boxes to buy.

  

• How to Calculate Exponential Smoothing Forecast in Excel

  Published 2026-08-19

  Walk through the exponential smoothing formula, build it cell by cell in Excel, and verify the (1-α)^k weights that drive every forecast.

  

• How to Calculate Electric Vehicle Charging Cost

  Published 2026-08-19

  Calculate EV charging cost from battery size, charge range, electricity rate, and efficiency. Includes the formula for charging losses and a worked example.

  

• How to Calculate EOQ From the Following Data

  Published 2026-08-19

  Given demand, order cost, and holding cost from a textbook problem? Use the formula Q* = √(2DS/H) to calculate EOQ and verify each step online.

  

• How to Convert Energy Into Mass Using E=mc²

  Published 2026-08-19

  Convert energy into mass with E=mc². Get the formula, see a worked example, and use the free Energy Converter to handle the energy units.

  

• How to Calculate Oval Perimeter Using Semi-Axes

  Published 2026-08-19

  Find the perimeter of any oval from its two semi-axes. The Ellipse Area Calculator returns Ramanujan's perimeter approximation plus area and eccentricity.